The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU)(A) 20(B) 230(C) 750(D) 1500.

The average thickness of ozone layer in stratosphere is about
__________ dobson unit (DU).
(A) 20
(B) 230
(C) 750
(D) 1500
by

1 Answer

Answer :

(B) 230
by

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